Apparatus for making coils of insulated wire



Oct. 20, 1931.

J. Q. HOLMES APPARATUS FOR MAKING COILS OF INSULATED WIRE 8 Sheets-Sheet l w w 2 H A 5 L a I? l 4 V I W 1 I n F an N 0 4h Oct. 20, 1931. J. Q. HOLMES 1,323,413

APPARATUS FOR MAKING COILS OF INSULATED WIRE Filed April 2, 1930 8 Sheets-Sheet 2 m 1 a Illlllllllll n r llllmlllmnnnnml/ g) Q lllllll uununu'r 5 m Oct. 20, 1931. J HOLMES 1,828,413

APPARATUS FOR MAKING COILS OF INSULATED WIRE Filed April 2, 1930 8 Sheets-Sheet 3 J. Q. HOLMES 1,828,413

Filed April 2, 1950 s Sheets-Sheet 4 Oct. 20, 1931.

APPARATUS FOR MAKING COILS OF INSULATED WIRE 7 J. Q. HOLMES Filed April 2, 1930 8 Sheets-Sheet 5 APPARATUS FOR MAKING COILS OF INSULATED WIRE! T w 1 l FAHMUI a 3M \wwz mmw M wvl & Q wt 7 .0 mn Y} s9 3 5 Q E E k v J v Om m om mmw w E J. Q. HOLMES 1,828,413

APPARATUS FOR MAKING COILS OF INSULATED WIRE Oct. 20, 1931.

8 Sheets-sheaf, 6

Filed April 2, 1930 Oct. 20, 1931. J. Q. HOLMES APPARATUS FOR MAKING COILS OF INSULATED WIRE Filed April 2, 1930 8 Sheets-Sheet 7 r0 o M no T v f m uum men 1 r w mmm. own w l w 0 H 1|: a w mrm M. I m s Q. on N\m W\m. n3 n I NM Wm n d H 1 Rm um. \.mm m S n D M QM. vMM mNm Qmm Oct. 20, 1931. J. Q. HOLMES APPARATUS FOR MAKING COILS OF INSULATED WIRE Filed April 2, 1930 8 Sheets-Sheet 8 Patented Oct. 20, 1931 PATENT TOFFICE Jenner HOLMES, or nnnnnson, INDIANA, Assrernon.roxnnnoo-nnmv conromirion,

OF. ANDERSONQINDIANA A CORPORATION OF'DELAWARE .APPAE'ATUS r03 MAKING SOILS OF nvsnnnrnn WIRE Application filed April 2,

This invention: relates to the: manufacture of wire coilsifor electricalwapparatus and particularly coils made'from IGlfltiVQlYrStifl insulated wire. The present invention redates to certain improvements in a machine for. automatically unreeling wire 'irom a-snpplyareeluand winding a portion ofit into a coil and then severing the coiled portion from the remaindenofthe wire connected -with the supply reel. .A'fter.having produced coils of insnlate'diwine by at machine of this type, it has been the practice to strip'the insnlation from the ends ofthe coil to.pro-. Wide for-electrically connecting'the endsof the wire topartsof the electrical instrument of which the-coihisapart. -The present inrent-ion provides means for 1st'r ipping the insulation of, the wire; bein g supplied to i the .mac-hineat. portions ;-sp.a-ced apartaat 1 regular predetermined distances snflicient to provide length for forming :the required :coil. This stripping means .is -so coordinated with the coil windingmachine that .afterza-coil has been wound it will he severed across the bared -01 strippedportion o't the wire, Therefore, the improved machine will, produce insulated wire*coils,'=theends ofwhich arebare of in snlation. "Thus, the :present improvement does *ZlWLY with the subsequent operation of strippin-gthe ends 'ot the coil after it" has been wound in i the l machine.

Further .objects and .advantages' of" the present invention will be apparent 'i'rom'the following description, reference 'heing had .to .the accompanying drawings :whereina preferred embodimentofione form-of the ,present invention is clearlylshown.

'In thedrawings: 7

Fig.1 isaperspective view of a coil winding machine embodying the present linven tion.

:la isaperspective view on a larger scale than .Fig. -1 showing a. coil 1 produced .by the machine. I v I Fig. '2 is a perspective view of the coil winding machine looking. in the direction oi arrow 2..in"Fig.3.

Fig. Sis a plan viewof' the machine. Fig. 4 is-a fragmentary sectional View on 1930. 9 Serial N0. 440,974.

Fig.95is .a fragmentary sectional view on the line Er- 5 ofFig. 3. V

FF 6 isanend .view in the direction of the arrow- G-inFigs. '3 and 9, certainparts being shownin sectionforithe sake ofclearnose. i

F 7 is a .-fragmentary sectional view takeneo'n the line 7-.-7 of Figs. 3 and 9.

Fig. i 8 is a fragmentary sectional view taken on. the line 8-8 oflFigs. 3 and 9.

'aFigUS. is. a fragmentary plan View ofcer- .tain -parts shown in Fig. 3' drawn to a larger scale than Fig. 3. The partsshown in section in Fig. 9 are taken on thesection line -9 9of=Fig, 7 and line 9.9 ofF-ig.8.

Fig. .1 0-is a.sectional viewitaken on the line*10.l0-of Figs-3, l0 l0 of-Fig.9,:and .ie o ofFigLll. 1 a Fig. 11 isaplan -view-.lookin-g in the direction of'the arrow,11 'ofFig. -10, the parts I 1 shown in section" being taken on. the section dine 11a11-a and 11b11Z -of.-Fig.. 10.

.Fig.:1-2 isea sectionalview on the line'1212 .of-Fig. 3.

-Fig. 13 is-a;sectiona1-view on .theline 13-13 ofiFig. 12. r

Fig. .14 is a-sectional view taken on the lin -M-el OfF-ig. 13. 4

of a-portion offthe'machine showing the in sulation-stripping mechanism.

' :Fig. 216 is aflongitudinal sectional view thereof taken substantially on 1 the plane of thelines 160@-16a2-and 16y-16y-of Fig. 15, and is viewed looking inthe direction of the arrows 16%.

"Fig. EI5'iS -a. Efragmentary perspective View Fig. 17 is; a fragmentary sectional view on .sectioniline 17 17 of Figs. 16 and 19.

Fig. 1-8 is a sectional view taken onsection line 1818 of Figs. 16. and .19.,

Fig. 19 is a fragmentary sectionalview similar to Fig. '16. and' is taken on the plane ofthe linesltiW-Gw and 16 y 16y ofFignlfi but is viewed lookinglin the direction of the arrows'l9 of Fig. .15. i

Fig. 20 is a chartshowing graphicallythe timeirelation between the rotation of the main shaft and crank'ofthe machine and the various mechanisms which are operated bytit.

Referring to Fig. 1a, the coil produced by the present improved machine has an inside layer of turns 31 and an outside layer 32. The inside layer has a start lead or terminal 33 bent at 34 at right angles to the plane of the first turn of the layer 31 so that it will expand substantially parallel with the axis of the coil. The end lead 35 of the last turn of the outside layer 32 extends tangentially to the coil 30 and at right angles to the start lead 33. The coil 30 is wound from relatively stiff insulated wire, preferably wire previously coated with insulating enamel. The start lead 33 has an end portion 33a which is bare of insulation and the end lead has a portion 35a also stripped of insulation.

In order to produce the coil shown in Fig. 1a, the present improved machine provides the following mechanism: means for feeding positively the wire through a distance sufficient to carry its ends 33?) where it was cut oil to the bending mechanism for bending it around the portion 34; a mechanism for bending the lead 33 about the portion 34 and for causing said bent lead to be engaged by and connected with the coil winding spindle; a coil winding spindle upon which the layers 31 and 32 are wound and mechanism for causing the spindle to be moved axially while being rotated in order to form the two layers 31 and 32; shears for severing the completed coil from the remainder of the supply of wire; means for guiding the wire from the shears to the winding spindle; a plunger which moves against one end of the winding spindle and follows its movement during the winding of wire thereon and then separates from the end of the spindle so that the coil after having been severed from the supply wire may be removed from the spindle, preferably by gravity; means for ejecting the finished coil from the machine after it has fallen from the spindle; and means for stripping the insulation from portions of the wire at regularly spaced intervals, the insulated portions between the bared portions being sufficiently long to form the required coil, and the stripping mechanism-being so related to the wire cutting mechanism that the wire will be cut across the bared portion in order that the end portions of the leads of the coil will be stripped of their insulation before the coil leaves the machine. These mechanisms will be described in detail in the order named.

. Positive feed of wire The coil forming mechanism is supported upon a table 40 having legs 41 and supporting bearings 42 and 43 for a main operating shaft 44 which carries a large gear 45 mesh ing with a smaller driving gear 46 fixed to a shaft 47 which carries a sprocket gear 48 connected by sprocket chains 49 with a driving sprocket gear 50 which is driven by an electric motor 51 through a speed reducing mechanism located within a case 52. The shaft 44 carries a beveled gear 53 meshing with a light bevel gear 54 mounted on a shaft 55 supported by bearings 56, 57 and 58. The shaft 44 carries a cam 60 shown in Figs. 3 and 5 and adapted to engage a roller 61 carried by a rack 62 slidably guided by bearing blocks 63 and 64. The roller 61 is urged towards the cam; 60 by a spring 65 having one end attached to a pin 66 fixed to the rack 62, the other end of a pin 67 fixed to the bearing 42. The extent to which the rack 62 may approach the cam 60 depends on the setting of a stop screw 68 adjustably attached to the rack 62 and adapted to engage the stop 69 fixed to the bearing 42.

Referring now to Fig. 12 the rack 62 meshes with a gear 7 0 on a shaft 71, rotatable in bearings 72 and 73 carried respectively by a plate 74 and a bracket 75 to which the plate 74 is attached. The gear drives a gear 76 which meshes with a gear 7 7 loosely rotatable upon a shaft 7 8 rotatable in a bearing 79 provided by the bracket and an upper bearing provided by the plate 74. The gear 7 carries a pin 81 pivotally supporting a pawl 82 engageable with a ratchet 83 fixed to the shaft 78. The pawl 82 is urged against the ratchet by spring 84 having one end attached to the pawl and the other to a pin 85 attached to the gear 7 7 The pawl and ratchet device provides for driving the shaft 78 in one direction only. During the backing up of the pawl 82 or rotation in a clockwise direction about the shaft 78. rotation of the shaft 78 in this direction is re sisted by a brake comprising a rotatable disc rotatable with the shaft 7 8 and movable slightly axially thereof. The disc 90 is urged 1 against the stationary top surface of plate 74 by spring 91 located between the disc 90 and a washer 92 held against the spring by the head of the screw 93 which may be screwed into the shaft 78 when it is desired to increase the pressure applied by the brake disc 90 upon the plate 74. The ratchet 83 is integral with the hub 95 of a wire feed roller or wheel 96 which cooperates with a companion roller 97 to feed the wire A when clamped between these rollers. The roller 97 is mounted on a shaft 98 journalled in a bearing 99 slidable in an elongated ohlonghole 100 in the bracket 75 and journalled in a 1 block 101 away from the shaft 78 a slight distance, but not to the extent that the gear 97a will be out of'mesh with'thegear- 96a.

' When it is desired to feed the wire A, the roller 97' will move tow'ardthe roller 96 so that the wire will. be ripped between the rollers." This movementof roller 97 laterally is effected by cam 110 fixed to-the shaft and engageable with a relief spring lever 111 fixed at 112 having its free end attached to rod 113, having its head end received by a notch 114 of T-shaped cross section provided in the block 101. The cams and'110 are so coordinated that during the time the cam 60 engages the roller 61 to move the rack 62 toward the right as viewed in Fig. 3, in order to effect counterclockwise rotation of feed roller 96 and clockwise rotationof feed roller 97 as viewed in Fig. 3, the cam will cause the roller 97 to be urged yieldingly through the leaf spring lever 111 toward the roller 96 whereby the wire A will be yieldingly gripped between these rollers in order that the wire may be fed toward the right as viewed in Fig. 3, or toward the left as viewed in Fig. 10. or from top toward bottom as viewed in Fig. ,9. Referring to Fig. 10, .a bracket 220 fixed to the table 40, carries shear block 221 having central bore throughwhich the wireA is fed. The block 221 cooperates with a movable shear blade 222 to sever the wire along the surface 2210 of the block 22 1. The mechanism for'positively feeding the wirewill cause the wire to be fed from the s'urface-221ato the'point 33600 which is the location ofthe end portion 330150 of the start lead of the wire 33a before it is bent into the position 33a-shown in broken dash'lines in Fig. 10. During the feeding of the wire by thepositive meansjdescribed and alsoduring'the winding of the wirefollowing the positive feeding thereof, the wire is unwound from a supply reel mounted on a spindle 121, and the wire-is caused to be fed by geared rollers 122 and 123 and through an insulation stripping device 300 to be described later and then between felt cleaning pads, one of which .is shown at 124 in Fig. 3 and is attached to the bearing 43, then between felt oilingpads i124 and 125 shown in Fig. 1. Pad 124 is sup.- ported by bracket 126 and pad 125 pressed against pad 124 by a leaf spring and supplied with lubricant from an oil cup 127. The wire then passes between rollers 96 and 97 and'then through a guide tube 128 fastened to a post 129 and through the bracket 220 which supports the cutting block 221. The geared rollers 122 and 123 are caused to ro tate through a mechanism including a shaft 130 which supports the rollerl 23 and carries a pulley 131 driven by. belt 132 connected with a pulley 133 driven by 'sha'ft'47 as shown in Figs. 1,2and'3. j

dash lines in Fig; 10 to the position 33a shown by dash lines includes ashaft rotatable in bearings 141 and 142 provided by a bracket 143 (see Figs. 9 and 11). The shaft supports coaXially, therewith an 5X1IQI1- sion or pin 144which is locateddirectly be low the wire and below a corner edge 145 which is provided by the auction of the annular surface-146 of the coil winding spindle and the longitudinal plane surface 147 of the notch 148 provided in the spindle 150 for receiving the start lead 33 or. the wire. The annular surface or shoulder portion 46 is formed by reducing the diameter of the spindle to provide the portion 151 upon which the coil is wound. As stated before, the projection 144 of the shaft 140 is locatedbelow the wire A and the corner 145 in order that the wire will be held against the corner 145 while being bent. The bending is performed by a second projecting pin 152 carried by the shaft 140. This pin 152 is rotated in a counterclockwise direction as viewed in Fig. 10 from a position below the end 33am of the wire A to the position shown in Fig. 10 by a mechanism which includes a rack 153 meshing with an elongated gear 154 integral with the shaft 140. The rack is guided by plates 155 and 156, the endsof. which are engaged in suitable grooves in therack 153. These plates are secured to the bracket 143 by screws157. Referring to Figs. 6 and 9, the rack 153 is .yieldingly urged downwardly by spring .158 having one end attached to the rack and the other to table 40. I The rack 153 is moved upwardly in order to bend the wire by lever 159 connected at 160 with the rack 153 and pivoted at 161 upon a bracket 162 and carrying a roller 163 operated by cam 164, the contour of whichis shown by dotand-dash linesin Fig. 7, which shows a tandem view of the cam'164, lever 159 and rack 153. The cam 164 is fixed to a shaft 165 which is supported by hearing 166 integral with bracket 162 and is connected by coupling members 167 and 168 with a shaft 169 journalled in the bearing 170 and carrying a gear 171 meshing with a gear 172 driven by shaft 55 which, as explained before, is driven by shaft'44 through gears 53 and 54. Gears 53 and 54 have the same pit-ch diameter and likewise gears 171 and 172, hence-shafts 44, 55, 169 and 165 rotate at the same speed.

After the bending operation has been performed, it is necessary to withdraw the bending mechanism from the windingspindle 150 before the winding upon the spindle can take is held while bending takes place, and imrotates in the direction of the arrow 181 to cause the ball bearing to move from the position 178a shown in dot-and-dash lines, into the position 178 shown in full lines in Fig. 7. Thus the cam 180 cooperates with the lever 175 to advance the bending mechanism into operating position. In order to retract the bending mechanism, the shaft 140 is moved toward the left as viewed in Fig. 7 by a cam 182 which cooperates with the roller 183 car- 1'2 ried by the lever 17 5, said cam 182 being riveted to a cam 235, also driven by the shaft 165. During the motion of the cam 182 in a counter-clockwise direction as viewed in Fig. 7, the roller 183 will be moved into thedotdash lines of 1834. in Fig. 7 in order to retract the bending mechanism from the spindle 150.

Spindle operating mechanism The spindle 150 is supported for rotary and axial movement by bearings 190 and 191 provided by bracket 192 supported by the table 40. The spindle 150 carries a broad face gear 193 meshing with a gear 194 which is :17) loosely rotatable upon a shaft 195 and is connected therewith by yielding lost motion connection which comprises a spring 196 connected at one end with a rod 197 extending from, the hub 198 of the gear 194 and attached to a rod 199 extending from a collar 200 at tached to the shaft 195. The spring 196 tends to pull the rods 197 and 199 together until lugs 198a and 200a of the hub 198 and the collar 200 respectively, are held in engagement. The purpose of this yielding lost motion connection is to insure that the spindle 150 will be located with its notch 148 in proper position to receive the wire which is bent into it before the winding operation starts. In or- .it der to provide for stopping the spindle 150 at the proper interval, it is provided with a stop lug 201 adapted to engage a stop pin 202 supported by the bearing 191. The spindle 150 is rotated clockwise as viewed in 4, until the lug 201 strikes the top of stop 202 whereupon the spindle 150 will stop rotating and-will be located so that its notch 148 will be located as shown in Fig. 9. This rotation of the spindle 150 is effected by counterclockwise rotation of the gear 194 and hence of the collar 200 and pin 199. The shaft 195 is rotatable through an angular distance counterclockwise greater than necessary than just to rotate the spindle against in the stop. Hence, after the spindle has stopped rotating the rod 199 will continue to move away from the rod'197 a certain dis tance, thereby increasing the tension in the spring 196 which actsto yieldingly maintain the spindle in the proper position. amount of lost motion betweenthe gear 194 and the shaft 195 is approximately five degrees.

The shaft 195 carries a gear 204 meshing with a rack 205 which is guided for horizontal movement by the table 40. The rack 205 is pivotally connected at 206with a connecting rod 207 connected with a crank pin 208 fastened to the gear '45. Therefore, during one rotation of the crank pin 208 the rack will make one reciprocation and the gear 195 one complete oscillation, in order to cause the spindle 150 to rotate first counterclockwise from its normal position in order to wind the wire A thereon, and then to return the spindle to normal position by clockwise rotation during which the coil wire is removed from the spindle.

In order to reciprocate the spindle 150 while it is rotating so that wire may be wound thereon in even layers, there. is. provided a plate cam 210 fastened to the rack 205 and provided with a shallow B groove 2 11 adapted to receive a roller 212 sup-ported by a slide bar 213 guided by bracket 214 and pivotally connected with a lever 215 having a bifurcat ed end 216 each arm of which is provided with a notch 217 for receiving a pin 218 projecting from a collar 219 surrounding the upper end of the spindle 150 and fixed against ax1al movement along the spindle. It is therefore apparent that during each stroke of the rack there will be two strokes of the spindle. As the rack moves from left to right the spindle 150 will be rotated counterclockwise'as viewed in Fig. 4 in order to wind wire thereon and during the winding operation the spindle will be caused to move upwardly and then downwardly in order that two layers of wire 31 and 32 Willbe successively wound upon the spindle. During the return stroke of the rack the spindle will rotate clockwise to its normal position and will be oscillated making an up stroke followed by a down stroke, but during this second oscillation no wire is wound on the spindle.

Shears forearm-ing the 6027 The l and carrying at its left hand end a roller metrically across a collar 252and a plunger 225 cooperatingwith a earn 226 fiXjeYdon the sha-ft 165. A spring 227 attached to the lever 223 and to a post 228 on a bracliet 229 yieldingly urges the roller 225 ag'ainst the cam-226 and the shear away from theorifice in the shear block 22L Means for gnicling the wire from the t0 the spindle shears v The means for guiding the wire from the shear blockto the spindle 150 comprisesfa bar 230 slidable in a groove 231 provided by the frame 143 and held in position'bya plate 232 secured by screvvs233. The bar .2 30,. fis

provided at its right hand end'withzagroove portion 234 throughwhich thefrwire' slides while being fed through the shear block 221 toa pointbeyond the spindle 150. Since the guide 234 must be moved away-from the shear block 221 while the shear blade 222 is operatingto cut the wire, the bar .230 is automatically actuated into operating position by a cam 235 engageable with a roller 236 pivotally supported by the bifurcated left end 23hr the slide 230 and yieldingly ating position and the spring. 238 movesit nto non-operating; position,

to the table 40. V against the cam 242 by spring 247 attached to the lever 244 to. the table 40. ,The shaft maintained against thecam235byspring 238 attached to one end of thespringpo'st 228 and at the other end to a pin 239 fastened to the bar 230 andextendingthrough a slot 240 in the frame 143. Obviously, the cam 235 moves the wire guide member 234 into oper Means for retaining the coil 0n the spindle V (liming the winding operation In order that the coil which is wound upon the mandrel portion 151 of the spindle will readily drop from said mandrelafter the coil has beensevered from the wire remaining in the machine, itris desirable that the arbor 151 be no longer than isfj'u'st necessary to windthe wire thereon, that is, no

longer than the coil itself. Therefore, in

order that the bottom turns of the coil will be wound properly upon the arbor, the machine provides aplunger 240 which is yieldingly pressed against the lower end of the mandrel 151. and follows the mandrel while the wire is being Wound thcreon and then with a roller 243 on a lever 244 fixed toQa insulation stripping mechanlsm 300 s supported by table-301 held .in elevated position shaft 245 journ alled ina bracket 246 attached The roller 243 1 is urged 245 carries lever 248'having a.bifurcatedend 249 each branch of which has a branch .250

fo re eiv ng a M1125 ,.wh chl xtelid fili 2 40 and within the plunger carries a block 253f or supportingone endof a spring 254, the other end of which bearsagainshthe underside of the cap 240a. The plunger 240 provided with afpair of diametricallyop posits slots255 for receiving the pin 251. The cam'242imparts such motionto the levers 244 and248-and block 253 as to causethe' guide block241. As the plunger descends the coil is severed from the wire themachinepthe, coil unwraps itself slightly from the arbor due to the resiliency of the ire and the. coil descends upona platform provided bythe upper end .of the cap 240a and the coil is then'ready to be ejected,

Gail ejecting mam -Referring to Figs. 10 and 1 1 .,thje coilej'e'ctor comprises a U-shaped pusher 250 mounted to slide over the top surfacesof the guide block 241 and thelplunger cap 240a when' the latter is flush with the upper surface of the guide lock. Thepusher 250 is operated automatically to push the coil down a chute 251 shown in Figs. 3 and 1. The pusher25O is attached to a rod 252 guided by the bracket 220 and by bracket 253; the right hand end of the rod 253 is pivotally attached at 254 toa lever v25 5 pivoted at-.256 uponthe table and car- Irying aroller 257 cooperating with acupshaped cam 2 58 attachedto the shaft 55 as shown also in Fig. 3, The lever 255(1Sh6ld down by strap 259and secured by screwsi260 .tothe table 40. A spring 261 attached to the lever255 and'to a post 262 on the table 40 yieldingly' urges the roller .257 against the cam 258. The cam operates to retract the pusher 250 and is shaped, so as to suddenly release the roller 257 so that the spring261 may operatequicklyto move toward the right the pusher" in order to eject the coil which has fallen upon the upper surfaces of the plunger cap 240a after the coil Was severed from the remaining wire. I nsnlation stripp 'ng mechanism iReferring to Figs.215 to 19 inclusive, the

by legs 302 and adjustably tiedto the table .40 by a screw 3Q3 having a'l1andle 3Q4 and threaded through .baifl3 O5 attache d in one of the table, legs 302 and havingfathreaded e eoejp sngmi ht pr iino oesn a bar 308 attached to one of the legs 41 of table 40. The threaded end 306 receives nuts 309 and 310, one on either side of the bar 308. By turning the handle 304 the table 301 may beshifted horizontally along the floor indicated at 311 in Fig. 19. In this way the stripping mechanism may be properly located relative to the coil winding mechanism.

Table 301 is provided with parallel V grooves 312 each receiving a V ridge 313 integral with a base 314 to which the insulation stripping mechanism is attached. The base 314 carries a bar 315 carrying a roller 316 engageable with a cam 317 attached to shaft 44. Roller 316 is yieldingly urged toward cam 317 by springs 318 and 319 connected with a cross bar 320 of table 40 and with a rod 321 extending downwardly from the base 314 through a notch 322 provided by the table 301.

The table 314 supports brackets 325 and 326 which carry pins 327 and 328 respectively upon which rocking frames 329' and 330 respectively are journaled. Frames 329 and 330 rotatably support spindles 331 and 332 respectively carrying on their outer ends pulleys 333 and 334 respectively, and on their inner ends rotary insulation stripping cutters 335 and 336. The pulleys 333 and 334 are connected by belts 337 and 338 respectively with pulleys 339 and 340 respectively, driven by electric motors 341 and 342 respectively, supported by the base 314.

As viewed in Fig, 15 the cutters 335 and 336 rotate clockwise and counterclockwise respectively and engage respectively the lower and upper semi-cylindrical halves of the insulation of the wire and strip off the insulation by a cutting action which takes place during one complete oscillation of the base 314. The wire is guided by tubes 343 and 344 supported by a bracket 345 attached to the base 314. The movement imparted to the base 314 during the insulation stripping operation is such a distance as will cause the portion of wire stripped to be equal in 7 length to the bared portions 33a and'35a of Fig. 1a. The cutter frames 329 and 330 are caused to oscillate about the pivot pins 327 and 328 by a mechanism operated by the shaft 44. Referring to Fig. 3, shaft 44 carries a sprocket gear 350 connected by chain 351 which passes around chain tightening pulleys 352 and 353 associated with the chain tightening device 354 and around a sprocket gear 355 fixed to a shaft 356 supported by brackets 357 attached to legs 302. The shaft 356 carries cams 359 and 360 engaging respectively rollers 361 and 362 carried by levers 363 and 364 respectively, which operate levers 365 and 366 respectively, connected by springs 367 and 368 respectively, with a bracket 369 so that the rollers 361 and 362 respectively, tend to engage the cams 359 and 360 respectively. The levers 36 5 and 366 respectively, are connected with slide bars 371 and 372 respectively, guided for horizontal sliding movements by brackets 373 and 374 respectively, having rollers 375 upon which the slide bars rest. The bars 371 and 372 are provided respectively with camming slots 377 and 378 respectively, which receive pins 379 and 380 respectively, attached to vertically slidable bars 381 and 382 respectively, having slotted upper ends respectively for receiving bolts 383 and 384 carried by the bifurcated ends 385 and 386 respectively, of frames 329 and 330 respectively. The cams 317 and 360 are so coordinated that just before the cam 317 begins to operate upon the roller 316 as shown in Figs. 16 and 19, to cause the table 314 to move away from the cam 317, the cams 359 and 360 will have been moved into the position shown in Figs. 16' and 19 in order to cause the cutter spindle frames 329 and 330 to move into position for bringing the cutters 335 and 336 into insulation stripping position. It will be noted that the ca1nming slots 377 and 378 are provided with elongated portions 377a and 37864 for the purpose of providing clearance for the pins 379 and 380 respectively, during the time that these pins are caused to travel horizontally when the base 314 moves horizontally first away from the shaft 44 and then toward it. Immediately following a stripping operation the cams 359 and 360 release the rollers 361 and 362 respectively, so that the springs 367 and 368 respectively, may retract the slide bars 371 and 372 respectively to a positionsuch that the camming slots 377 and 378 will cause the pins 379 and 380 to be elevated and lowered respectively so that cutters 335 and 336 will be lowered and elevated respectively away from the wire. In this way the wire is free of the cutters while it is being positively fed to the spindle and while being wound upon the spindle.

Sequence of operation The sequence of operation of'the various mechanisms of the coil producing machine can best be explained with reference to the chart in Fig. 20. The distances measured horizontally represent degrees of rotation of the shaft 44 or crank 207. The base line ab represents 360 degrees of crank rotation. The curve ABC represents movement of the rack 205 away from the left, distances of points on the curve abc above the base line ab representing distances from the left hand position of the rack. Since there is 5 degrees lost .motion between the rack and spindle, the

spindle will begin rotating at 5 degrees past the normal or left hand dead center position of the crank and will rotate in a counterclockwise direction until 180 degrees during which time the coil is being wound and then will rerate, but is so located with respect to the crank 208that the spindle is caused to move up from home posit-ion during the first 97 of crank rotation represented by curve DE, then down during 97 to 180, or the follow ing 83, represented by curve EF, then u during 180 to 263, or the following 83, represented by curve FG, and down to home position during 263 to 360, or during the last 97 of crank rotation represented by curve GH. These curves are of the same slope, hence point F is slightly above the base line GH. This denotes that at the end at the coil winding operation which takes place during the first up and down movements of the spindle represented by curve DEF, the spindle is slightly higher than when at home position denoted by points D or H. This construction therefore provides for locating the stop arm 201 above the stop pin 202 (see Fig. 4) at the end ofthe period of counter-clockwise rotation of the spindle and at the beginning of the period of clockwise rotation. Thus the spindle stop is non-operative except at the end of the period of clockwis'erotation of the spindle. During the movement of the spindle represented by the curve FGH no winding of the wire takes place.

Curve JKLMN represents the movement of the plunger and the dot-dash line curve J 'K'LM represents the movement of the plunger operating arm 248. It will be noted that this arm has a greater movement than required for operating the plunger the necessary amount so that the spring 254 shown in Fig. 6 will be compressed slightly beyond its initial state so that the upper end of the plunger will follow the lower end of the spindle as indicated by the curve KLM which follows the curve DEF which represents movement of the spindle. Curve OPQR represents the movements of the guide bar 230. Between 180 degrees and 270 degrees represented by the line R0 the guide is re tracted from the wire. It begins to move at O or at approximately 27 0 degrees and completes its movement into wire guiding position at P or about 300 degrees. The wire grees when it starts to move away as incli- 180 degrees. Curve STU represents the up and down movement of the shear 222. Knife 222 begins to move at S or about 175 degrees and cuts the wire at T about 190 degrees while the wire guide is retracted. Knife 222 returns to lower position at U or about 200 degrees at which time the ejector operates as indicated by the curve UVl/V. Point V on the curve at about 220 degrees represents movement of the pusher 250 of Fig. 11 to a as the. wire guide has moved into operating position as indicated by point -P at300 degrees, the'feedingwill begin and will take place between 300 and 330 degreesm The lop catin-g of the wire guide is accompanied by i movement of thebende'r of the start lead into 7 operating 'position. The movement of the bender sh'aft toward the spindle is represented by-curve The, shaft 140 remains adjacent the winding spindle for a time represented byYZ'. ZAA represents movement ofthe benderishaft.140 away from the wind 'ing spindle. Immediately following the positivefeeding operation of the wireythe bender begins'to' turn at330 or at point BB 1 and c'ontinuesto turn tobend the wireduring theinterval represented bythe curve BBCC.

As soon as the bender is turned to bend the wire it immediately returns tonormal position asi'ndmatedby-the curve CGDD. The

returnrotation of'the' bender takes place while the bender is moving out as represented "by curve .ZAA. The line 1 EEFF represents the' interval during which the insulation stripper is operating: It will benotedthat th stripper OperatesbetWeen-ISO and 290 degrees or immediately following a coil winding operation and before the next succeeding floper'atlon'of positively feed ng'the 'theshear to the spindle.

wire-from f." WVhile the formof embodiment of 'thepres- 'entinvention as herein disclosed, constitutes "a preferred form, it is tobe understood that other forms might be adopted, all coming within the scope of the claims which follow.

" /Vhatis claimed isas follows:

, 1.. Apparatus for making coils "of-insulated wire torfele ctrical instruments, comprisin in combination, means for stripping theinsulation from the I wire at portions spaced at regular intervals, means for windng .the'insulated portion ofthe wire into a co1l,andnieansfor severing the wire intermediatefthe': extremities of the stripped por tionof the wire whereby the apparatus produces coils of insulated wire havingbared end portions. gulde remains 1n position until about detai T cuttersoperating on oppositesides of 'the wire'anda'mechanism for causing the cutters to traverse the wire while rotating."

' 3. Apparatus according to claimll further characterized as having an insulation stripping means consistlng of a palrof rotary 2. Apparatus according to claim 1' fur- .tli'er 'characte'rlzed as hav ng an insulation cated by line QR, finishing its movement at Em -m a s nsi f a r f tatably supporting the arms, a base supporttit? means for stripping the insulation from the Wire at portions spaced at regular intervals,

said stripping means operating beforethe Wire is positively fed tothe arbor, and means operating after coiling the ire for cutting the Wire across a bared portion to sever the coil fromthe remaining Wire whereby the apparatus produces coils of insulated Wil'G having bared end portions.

5 Apparatus for making coils of insulated wire for electrical instruments, comprising in combination,a Winding arbor, means for positively feeding the Wire to the arbor, means for bending the end portion of the Wire presented to the arbor arounda part of the arbor to attach the Wire to'the arbor for winding purposes, means for rotating the arbor, means for axially moving the arbor While rotating, means for stripping the insulation from the Wire at portions spaced at regular intervals, saidstripping means operating before the feeding and bending operations, and means operating after coiling the wire for cutting the Wire across a bared portion to sever-the coil from the remaining Wire whereby the apparatus produces coils of insulated Wire having bared end portions.

6. Apparatus for making coils of insulated Wire for electrical instruments, comprising in combination, a Winding arbor, means for attaching the wlre to the arbor, means for rotat ng the arbor first in a Wire avinding direction, then in a return direction, ineans for axially moving the arbor While rotating,means operating during the return rotation of the arbor and'before the Wireto-arbor attaching means operates'for stripping the insulation of the Wire at portions spaced at regular intervals, and means operating after the arbor has Wound a coil of wire thereon for cutting the Wire across a bared portion to sever the coil from the remaining Wire whereby the apparatus produces coils of insulated Wire having bared end portions.

In testimony whereof I hereto aflix my signature.

JOHN HOLMES. 

